309874 has 4 divisors (see below), whose sum is σ = 464814. Its totient is φ = 154936.

The previous prime is 309857. The next prime is 309877. The reversal of 309874 is 478903.

It is a happy number.

309874 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 478903 = 59 ⋅8117.

It can be written as a sum of positive squares in only one way, i.e., 308025 + 1849 = 555^2 + 43^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (309877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77467 + ... + 77470.

2³⁰⁹⁸⁷⁴ is an apocalyptic number.

309874 is a deficient number, since it is larger than the sum of its proper divisors (154940).

309874 is a wasteful number, since it uses less digits than its factorization.

309874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154939.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 309874 is about 556.6632734428. The cubic root of 309874 is about 67.6698238663.

The spelling of 309874 in words is "three hundred nine thousand, eight hundred seventy-four".